Seoul · AutumnMonth summary
Seoul weather in September
✅ Good
🌡️ Temperature min / max
18°C – 25°C
🌧 Rainy days
31% of days
☀️ Sunshine
10.0h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.8/10
📅 📅 Best month
June (8.1/10)
Quick decision
Should you visit Seoul in September?
✅ Good
✅ Yes if: you want shoulder-season value — fewer crowds, 25°C.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: Seoul in September: 25°C and 10.0h of sunshine. Decent, but not the peak.
By trip type
Seoul in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ✅ Good
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 One of the best months — 25°C, maximum sunshine and ideal conditions Autumn in Seoul is often underrated: 25°C, golden light and declining crowds. An interesting window. Expect rain on 31% of days — a light raincoat in the bag is recommended. A good balance between weather and crowds, even if June (8.1/10) remains theoretically better.
Browse by month
All months for Seoul
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌨️ January | -6°C | 2°C | 10% | 0.6 | 8.7h | 5.1/10 |
| 🌫️ February | -5°C | 5°C | 16% | 0.9 | 9.5h | 5.0/10 |
| ⛅ March | 0°C | 12°C | 20% | 1.4 | 10.1h | 7.0/10 |
| 🌤️ April | 6°C | 18°C | 22% | 2.1 | 11.0h | 7.3/10 |
| 🌤️ May | 12°C | 23°C | 27% | 3.6 | 11.9h | 8.0/10 |
| 🌤️ June | 18°C | 27°C | 34% | 4.2 | 11.1h | 8.1/10 |
| ⛅ July | 22°C | 29°C | 56% | 10.1 | 9.9h | 7.3/10 |
| 🌤️ August | 23°C | 30°C | 52% | 8.9 | 10.9h | 7.4/10 |
| 🌤️ September | 18°C | 25°C | 31% | 5.3 | 10.0h | 7.8/10 |
| 🌤️ October | 9°C | 18°C | 23% | 2.7 | 9.2h | 7.2/10 |
| ⛅ November | 2°C | 12°C | 20% | 1.7 | 8.8h | 6.4/10 |
| 🌨️ December | -5°C | 3°C | 15% | 0.9 | 8.4h | 4.8/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Seoul averages 25°C, 31% rainy days and 10.0h of sunshine per day. Overall weather score: 7.8/10.
See methodology →
Comparison
September vs June (best month)
The best month is June (score 8.1/10). Difference:
- 🌡️ Max temperature : +2°C
- 🌧 Rainy days : +3%
- ☀️ Sunshine : +1.1h/day
FAQ
FAQ — Seoul in September
Is September a good time to visit Seoul?
September is an excellent time to visit Seoul (score 7.8/10). With 25°C, 10.0h of sunshine and 31% rain, conditions are very favourable.
What to do in Seoul in September?
With 25°C max and 10.0h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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Activities & tours
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